I think you are failing to use the most valued resources! Talk to your brother and your friends that play! They will help you if you ask.
If you're brother won't help, then I say you get a free pass to put toothpaste in his shoe, and if your friends won't help, then you need new friends. Music is to be shared, and that doesn't just mean playing it for others. It means that you should help others to get started, just as others helped you in the start.
Another sure bet is to go to your local guitar shop/shops, and talk to the folks there. They would love to help you get started, but make sure to take an experienced musician with you if it is at all possible.
Good luck!